package com.bryce.springcloud.lb;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author Bryce
 * @create 2021-04-06 21:06
 * @Description
 */
@Component
public class MyLB implements LoadBalancer{

    private AtomicInteger atomicInteger = new AtomicInteger(0);

    public final int getAndIncrement(){
        int current;
        int next;

        do{
            current = this.atomicInteger.get();
            next = current>=2147483647 ? 0 : current+1;

        }while (!this.atomicInteger.compareAndSet(current,next));
        System.out.println("****第几次访问，次数next: "+next);
        return next;
    }
    @Override
    public ServiceInstance instances(List<ServiceInstance> serviceInstances) {
        int index = getAndIncrement() % serviceInstances.size();

        return serviceInstances.get(index);
    }


}
